Ore-concentrating machine.



nu. 695,695. I Patented Mar. |s|9"o2.

w. mcnEnmoTT & F. 2. ELMonE.

URE CONCENTRATING MACHINE.

(Applictrm filed Jan. 4, 1901.)

' 3 Sheets-Sheet I.

(N0 Model.)

W/TNESSES. @www 6L. fwn? #my im@ 4 WMM@ 'ma Nanms Pneus co.. Pno'muma. wAsnmuToN. U. c.

No. 695,695. Patented Mar. la, 302,117

.w. mcnEnMoTT L F; .|:|.Mo^n.

ORE GUNOEHTRATING MAC-HLN E`..l

(Application filedv Jan. 4, 1901.)

y heats-sheet 2.

(No Model.)

llll llllllllllllllll||l|||\\ /Nvf/vroRs.

WMA/5355s.

i @wel ce. WM?

i. MM@

mi nnms rErEns co.. ruouuwa. wAsnmoTqN. D. cA

No. 695,695.y Patented Mama, |902; w. McnEmoTT & F. E. ELMoRE.

URE CDNCENTBATING'MACHINE.

(Application led Jan. 4, 1901.)

UNUSED STATES ATENT Fries,

VALTER MODERMOTT AND FRANCIS EDWARD ELMORE, OF LONDON, ENG- LAND, ASSIGNORS TO THE FRUE VANNING MACHINE COMPANY, OF DE- TROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

ORE-CONC'ENTRATING' IVIACHINE.

SPECIFICATION forming part of Letters Patent No. 695,695, dated March 18, 1902.

Application filed Januarye, 1901. semina. 42,046. (No moda.)

To all whom t may con/cern.-

Beit known that we,WALTER MCDERMOTT, mining engineer, and FRANCIS EDWARD EL'- MORE, electrometallurgist, subjects of the Queen of Great Britain, residing atLondon, i England, have invented a certain new and useful Improvement in Ore Concentrating Machines, of which the following is a specification. A

This invention relates to improvements in the construction of the class of concentrators employing traveling shaking-belts and usually known as vanners. Such machines have hitherto been operated by means of an i 5 eccentric or crank-shaft which communicated the horizontal shaking motion to the belt and transmitted to it at the same time by various devices a slow revolving motion, the parts being arranged in such a way as to admit of occa- 2o sional regulation ofthe revolving speed of the belt independent of the fixed speed of the `crank-shaft. In all such concentrators the shaking motion is small in extent, but rapid in speed, in order to get the necessary agitation z 5 of the crushed ore and water fiowing down the surface of the belt while subject to treatment, such speed being always in the neighborhood of two hundred revolutions of the crank-shaft per minute with a motion of about one inch in 3o extent. The long supporting-frame with its attached rollers and supported belt make together aheavy weight to be thus rapidly oscillated, and as a consequence a great strain is thrown on the cranks and through the crank- 3 5 shaft to the framing carrying it from this repeated rapid change of motion. It is mostimportant in this class of concentrator thatthe shaking motion given the belt should be a smooth reciprocating motion, free from any 4o jar or percussive effect, since this last immediately affects the distribution of the ore and water on the belt by jerking the heavier particles to one side or the other. Again, any such knock or jar resulting from looseness of the connecting-joints or play in the crank-bear- .ing of the connecting-rods or strap of the eccentric or play in the bearingsof the crankshaft will in such a machine lead to rapid deterioration. For these reasons careful and constant attention is required to keep the machines in proper working order and to maintain the highest efficiency in concentration of the ore. To meet the continual strains on the frame of the machine, it has been found in practice with' these concentrators that heavy timber supports give the best results in stiffness and endurance, although the other advantages connected with lighter iron frames has led to their partial adoption.

Thisinvention relates to amethod of construction which reduces first cost, decreases floor-space, avoids danger in looseness of the connecting-rods, diminishes shipping Weight, and by reducing strains allows of a verysilnple system of framing.

In the accompanying drawings, Figure l is a side yelevation of the improved machine. Fig. 2 is a plan. Fig. 3 ispan end elevation, and Fig. 4f is a plan, of a part of the machine, showing a modification. Fig. 5 is a side elevation of a leveling and adjusting part, of which several are used in the machine; and Fig. 6 is a plan of a modified form of same.

l is the endless slowly-revolving flanged belt, which passes overrollers 2 3, supported on a slightly-inclined shaking-frame 4, which rests on legs or toggles 5. This shakin g-frame 4 carries the necessary rollers 6 to give the belt the requisite degree of tightness. Down onto this inclined belt the ore'to be concentrated is supplied from thehopper 7, jets of water being also supplied from a trough 8, having a number of nozzles, and such ore is subjectedv to the regular shaking motion, which causes the mineralof higher specific gravity to settle down through the lighter rock particles and touch the belt.

particles past the washing Water jets and around the front end roller 2, finally delivering them into the tank 9, illedwith Water, which washes them olf the belt as this passes in a reversed position through saine. The

The slow upward travel of the belt conveys these heavierV eccentrics. In this arrangement a crankshaft 10 is placed between two independent belts 1 1. The shaft 10 is carried on three iron pedestals 11, which. can be simply bolted down to transverse beams 12, forming the foundation. This crank-shaft 10 is fitted with several cranks or eccentrics, six being shown in the drawings, the connecting-rods 13 of which are attached to the under side of the frame at on either side. These connecting-rods 13 can be of thin flat steel, either bolted rmly to the frame or resting in a recessed bearing bolted to the frame. These shaking frames are either connected together with springs or equivalent devices 14 14, as shown in Figs. 1 to 3, or each is connected with the pedestals 1l, as shown in Fig. 4, according as the cranks 15 are in opposition for the two belts or working in the same line, as will be hereinafter explained.

The crank-shaft 10 carries two cone-pulleys 16 1G, on which by small straps hang sliding pulleys 17 17, attached to worm-gear shafts 1S 1S, which are supported on casings 19 19, each containing a worm-wheel, the whole hanging on brackets 2O 20, through bearings of which pass the shafts of the worm-wheels on which are the crank-arms 21 21. These arms slowly revolving drive the head-roller 2 by means of spiral-spring connections 22 22, which yield to allow of the shaking` motion of the roller 2, but at the same time permit the rotary movement, and thus eect the travel of the belts 1 1. Movement of the pulleys 17 17 along the worm-shafts 13 18 by hand-screw 23 23 and with reference to cone-pulleys 16 1G permits of independentI regulation of the speed of travel of the two belts 11. The supporting-toggles or rocking legs 5 5 rest in shallow sockets 24 of a casting which is carried on longitudinal strips 25, resting on the foundation beams 12. These castings, as shown in Figs. 5 and 6, have slotted boltholes 26 2G to allow of adjustment sidewise and can have a vertical screw adjustment 27, Fig. 5, for leveling the shaking-frames or slightly altering their inclinations to meet re quirements, all in a manner well known in this class of apparatus. If the leveling-screw 27 is not used, the socket 24 is formed directly in the casting, as shown in Figs. 1, 2, 3, and 6, but when used the socket 24 is formed in the head of screw 27.

In consequence of the arrangement described the action of the cranks or eccentrics is that of a constant thrust, the springs keeping the shaking-frames always in contact with the shaft through the connecting-rods, so that caps to the connecting-rods could be dispensed with, there being no drawing strain, as in the usual construction. This action of constant thrust prevents any looseness in the bearing, as all wear is taken up without adjustment and a perfectly smooth rotary motion is obtained, which is necessary for the most perfect work of a concentrator. Of course the same effect can be produced by reversin g the action of the springs and making the cranks work by constant draw instead of thrust.

1f the cranks driving the two shakingframes are placed in opposition, as shown in Figs. 1 to 3, there is practically no strain on the supporting-pedestals and foundations, as the thrust is in opposite directions, and great steadiness is thus obtained. If the cranks are arranged to run together, as in Fig. Lt, the thrust of the two shaking-frames will come alternately. These alternative arrangements are described for the following reason: In putting the strain of thrust against a spring it follows that the crank-shaft is doing its whole work during one half of its revolution with a retarding effect on its speed, and during the other half-revolution there is an aecelerating effect on its speed from the accumulated power of the spring. When the thrust is simultaneous on the two frames from the cranks being in opposition, it follows the relative effects of retardation and acceleration on the speed of crank-shaft are increased over those of driving a single shaking-frame. On the other hand, when the cranks run together the one balances the other as to retardation and acceleration, so that there is practically no difference between the two halves of the revolution of the crank-shaft. Heavy ily-wheels on the crank-shaft and the high speed employed prevent this point being very marked, but in the treatment of some grades of ore containing relatively coarse or very heavy particles a very slight variation in different portions of the stroke may effect the distribution of the ore by causing a gathering or collecting of the ore to the one or other side of the belt. In all ordinary cases, however, it is obviously an advantage to balance the strains by running the cranks in opposition, and thus doing away with all vibration in foundations. The form of construction adopted allows also of great rigidity, if needed, in the pedestals carrying the crankshaft.

l/Vhat we claim isl. In a concentrator of the class described the combination with two belts 1, frames for supporting same and means for causing said belts to travel, of a common operating-shaft 10, connecting-rods 13 carried bythe frames, cranks carried by the shaft and acting on the connecting-rods for moving both frames in opposite directions, connecting-rods engaging with the cranks without caps whereby a thrusting motion only is imparted to them, springs la connected to said frames for producing a reverse movement of same,whereby an even motion without jar is obtained, two cone-pulleys 16 on the shaft, a driving-roller 2 for each belt 1 and means connecting each cone-pulley with a roller so that the two belts while driven from the shaft 10 may be independently regulated with reference to the speed of the latter.

2. In a conccntrator of the class described,

the combination with two belts 1,'1 means for whereby an even motion Without jar is obcausing same to traveland frames 4 supporttained.

ing same of a common operating-shaft l0, In testimony whereof We have hereunto set foundation-beams 12 transversely arranged our hands in the presence of two subscribing r 5 5 to the belts, pedestals l1 for carrying the Witnesses.

shaft centrally located on same, connecting- 1 rods 13 carried by the frames, cranks l5 With- I ORE out caps carried by the shafts and acting on A c the connecting-rods fornjoving both frames Witnesses: ro in opposite directions, and springs 14 for pro- WALTER J. SKERTEN,

ducing a reverse movement of the frames T. J. OSMAN. 

